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## 'Why 8?' printed from http://nrich.maths.org/

Choose any four consecutive even numbers. (For example: 6, 8,
10, 12). Multiply the two middle numbers together. (e.g. 8 x 10 =
80) Multiply the first and last numbers. (e.g. 6 x 12 = 72) Now
subtract your second answer from the first. (e.g. 80 - 72 = 8)

Try it with your own numbers. Why is the answer always 8?